Start stop printing telegraph system



Feb. 9, 1932. H, ANGEL ET AL 1,843,909

START STOP PRINTING TELEGRAPH SYSTEM Filed Sept. 26, 1930 MT1? gr 2f Qwvemtom n @2f/Magg@ Patented Feb.v 9, 15.932

irs rares HERBERT ANGEJ AND JAMES W. ROBINSON, OFBRGOKLYN, NEW YORK,

A tenete risica assiGNons To THE-`VESTERN NON TELEGRAPHCOIVIPANY, OF NEV YORK, N. Y., A CORPORA- TN OF NEW YORK START STO? PRINTING TELEGRAPH SYSTEM Application filed September 26, 1930. f Serial No. 484,668.

' system must, for correct telegraph communications, be maintained in synchronism with each other.

Suc-h synchronisni is obtained by arranging to operate the receiving distributor stopstart under the control ot the transmitting distributor. ln a .startstop synchronous system, the receiving station distributor rotates to a predetermined stop position, trom which point it starts into rotation again in` response to a i'eceived start impulse transmitted by the transmitting station distributor when it has reached a predetermined start position. The transmitting and receiving station distributors may` tlius be started simultaneously from a fixed position and rotated one revolution in synchronism.

Eoth distributors comprise rotating brushes and a plurality or" segments, 'usually seven in number. Five ot these segments transmit telegraph code combinations ot tive impulses each. In addition to these tive segments, there is a stop segment and a start segment on the transmitting distributor and aprint ing and stop segment on the receiving station distributor. Y

'lhe recei Ting distributor is rotated slightly faster rate of speed than the transf mitting distributor, so that, although both the transmitting` and receiving distributors start out simultaneously on equivalent positions, the receiving` distributor will complete its revolution before the transmitting distributor.

When the receiving distributor is on the stop segment, it is ready to start in response to ,the receipt of the start impulse condition. An ordinary start impulse condition ot a predetermined character would obviously not suffice, due to the fact that the last impulse l condition oi the code combination will, in a atra number of code combinations, be of the saine polarity or condition as the f start impulse condition, so that the ,receiving distributor could not distinguish therefrom.

Accordingly, provision must .be made for enabling the receiving distributor to distinguish a start impulse condition from the last one of the preceding code combination ot impulse conditions.

Heretoicore, this has been accomplished by providing a stop impulse of a predetermined polarity, followed by a start impulse, also ot a predetermined polarity, but differing from that ot the stop impulse condition. .Y

Following the receipt ot a complete code combination ot impulse conditions, thereceiving distributor will respond to these two predetermined impulse conditions, to start intorotation simultaneously with the transmitting distributor.

In such an arrangement, seven impulse conditions are necessary for each.selectiontive impulse conditions for a character, a sixth impulse condition for a stop condition and a seventh or sta-rt impulse condition. AIn high speed telegraphy, it is desirable that the number of impulse conditions for each selection be reduced to as few as possible, in order to make maximum use of the line time. The elimination, therefore, of one impulse condition in each code combina-` tion will, accordingly, be highly desirable, so that, it it were possible, it would bepreferable lthat the cycle be comprised ofcode combinations of live impulse conditions each and a single start impulse condition. y

Such. a condition can be obtained if some means is provided for enabling the receiving distributor to properly distinguish thestart impulse conditions from the last impulsev conditions Vof the preceding code combination.V y l lVit-h the receiving distributor on-the start seginentit can only distinguish the start impulse condition it, iii some way, it differs invariably from the last or iifth impulse condition. Y Accordingly, an object of our invention is to provide novel means for maintaining two remotely disposed distributors in a signalling system in synchronism.

A further obj ect ot our invention is to provide novel means tor operating a six pulse start-stop telegraph system.

A further` object of our invention is to provide novel means for ena-bling the receiving distributor to distinguish a single start impulse condition trom the fit'th impulse conditionlof the preceding code combination.

Heretot'ore, six pulse start-stop telegraph Systems have been provided operated with mechanical mechanisms ot involved character. Complicated cams and interlocking` members have been necessary to'distinguish the sixth or synchronizing impulse.

Accordingly, a further object of our invention is-to provide novel means for controlling a six pulse start-stop telegraph system by electrical means.

Still' another object otA our invention is to provide novel= circuits for operating a six pulse start-stop telegraph system.

Other objects of our invention will be more fully understood upon reference to the tollowing detailed description, taken in connection with the accompanying drawing, while the scope of our invention will be pa-rticularly pointed out in the appended claims.

In the drawing, the figure is a circuit diagram embodying our invention.

As shown, a transmitting station T and a receiving station R are connected by a signalling line 1v1.

At the transmitting station a distributor 12 is shown in developed torni, comprising a transmitting section having a plurality ot segments 13 to 17, over wh-ich code combinations ot'impulse are transmitted, in a manner lto be described hereinafter and a start segment 18.

Segments 13 to 18 are wiped over by the brush 19, carried on the brush arm 20, which is driven by a motor (not shown). Brush 1 arm 20 also carries the brush 21, which wipes over the solid ring 22 and, with the brush 19, bridges the segments 13 to 18 and solid ring 22. The brush carrier 2O also carries brushes 23and 24, which bridge the solid ring 25 and segmented ring 26 of the transmitting controlling section. Ring 25 is grounded, shown.- The second segment ot segmented ring 26 is connected over conductor 27 to the relay winding 28, which, in turn, is connected 'f to the iifth contacter 'of the transmitter or sending contactor 29 and which controls the polarity of the start impulse, in a manner to be described in detail hereinafter.

The transn'iitter 29, which may be either key operated or tape operated, is herein disclosed, for purposes o1c illustration, as comprising two bus bars. Positive polarity applied to the one bus bar and negative polarity is applied to the other. The transmitter, also comprises a plurality of contacting devices 31, which are operated in accordance with the perforations ot a tape or key bar operation to selectively engage either the positive or negative bus bars, as illustrated.

rillie first tour of these contactors are connected to individual ones of the first four segments 13 Vto 16. rElie fifth segment 17 is connected to the winding ot relay 33, the armature 34 oi'` which is connected to start segment 18 and operates between contacts connected to the positive and negative side oiC battery..

As is well known in the art, the tape transmitter is provided with a series oi teelers which project through the perioratons of a code perforated tape, to cause the engagement of the contactors, such as 31, selectively with the positive and negative busbars.

An electromagnet 35 is periodically energized and deenergized to permit the feelers to move into the perin'orations ot the tape and to remove the teelei's from the tape, during which period the tape is, at the same time, stepped to present a new set of pertorations in the tape to the feelers. This magnet 35 is connected over conductor 36 at the fifth segment on segmented ring 26.

The code combination of impulse conditions generated at the contactors 31 and positive and negative busbars are transmitted over the iirst four segments 13 to 16, brushes 19 and 21 and ring 22, to the relay 37 connected to the solid ring 22. Grounded relay 37 repeats these impulses by means ot its armature 38 over conductor 11 to the synchronizing` relay 39 the remote station, which is connected in series with the winding ot receiving relay 41. Relay 4i'. has an armature 42 operatingl between contacts connected to the positive and negative side ot battery and connected over conductor to the ring 44 of the receivingl station distributor.

Ring 44 is provided with a stop segment 45, on which the brush 46 is normally latch-ed in stop position when the armature 47 oi" stop magnet 48 is in its cle-energized position, as shown. The circuit 'for stop magnet 48 is controlled by armature 49 ot the relay 39 and by stop segments 6l and 45. ',ihe brush 66, carried on thesame brush-arm with brush 46, wipes over the receiving n@ments 62 ot the receiving),` distributor, as i* l driven by a motor (not shown) in appro-iiuato synchronous speed with the transmitting tion distributor brush. The iirst lire t ments 62 are connected to the printing inagnets 63 and the sixth segment connecte to the printer operating magnet 64. it wiil ie noted that segments 62, separated by irsulated sections, are much smaller than the transmitting segments and are placed in the center of the segment and wiped over by the brush during the middle of each impulse period. This is so arranged in order that the receiver will respond to thepealifof eachsignal impulse.

ln operatiointhe apparatus is normally. in the position shown, with the brush arm '20 over the fifth segment l?, which is also its normal stop position. it this point an energizing circuitis completed for the magnet from ground, over ring 2o, brush 23 and 24, conductor 36 and through electromagnet 35, to `positive battery. 'Electromagnet 35 is Venergized and holds the feelers Y(not shown) out of the perforations of the tape (not shown), so that all of the contactors 31lremain in their normal non-operative position.

At the remote receivinO` station the electroinagnet 39 isfenergized and its armature 49 is in the positon shown. 'l ie brush 46 is in its stop position, ,ipiiovvn' and in engage ment with the stop segments and 61. Armature 47 is in its `cle-energized condition and holds the brush 46 in the position shown.

ln order to start operations., the transmit ting operator at station T will operate the transmittine lie'y 51, to engage its lower contact 52 connected to positive battery. A circuit is thereupon completed over the conduc- Y Will be further assumed that the i'ifth ini-V pulse of the previous code 'which was trans mitted was a positive impulse condition, as a result of which, the armaturc36 of the rela y 37 has been operated into engagement With the positive segment, as shown.

The ifth contactor 31 has, under the con- Y- ditions assumed, energized the relay 28 to set its armature 41 in the position shown,

which, in turn, has completed an energizing' circuit for the Winding of relay 33, as a result of which armature thereof Was set in' the position shown W hen now the brush 2O starts rotating and the brush 19 Wipes over segment 16, current from the negative side of battery at armature 34 flows over the segment v18` through the brushes 19 and 2l, ring 22, to the Winding As the armature 38 moves between the tivov contacts, the current in line l1 is reversed and the inherent momentaryl zero is used to operate relay 39 at the receiving station which is momentarily deenergized, permit- -i ting armature 49 to drop to its back contact.

An energizing circuit vis thereupon completed:

through the magnet 46, segmentl 61, brushesV 66, 46 and segment 45 to negative battery.

The energization of magnet 48 operates ar-l mature 47 from engagement Wit-h the 'brush arm 46. Brush arm 46 is thereupon released for the rotation bythe motor and brushes 66 and 46 now revolve in synclironism for one revolution. l

As the brush arm 24 moves off the fifth segment of segmented ring 26, tape control magnet 35 is deenergized, 'permitting the feelers to move through the perforations of the tape, in accordance with the tape perforations presented to the feelers at that time.

F or the purpose of the present illustration, it Will be assumed that the first two contactors of the transmitter engage the negative bus and the nez-:t three engage the positive` bus, as shown. [is the brush 19 Wipes over segment 13, the first impulse condition of the code combination is transmitted. ln this case it is anegative impulse condition which flows over the first contacter 31,through the segment 13, brushes 19a'nd 21, ring 22, to'

the Winding of relay 37 and ground.

Armature 38 is at this time already in engagement with the negative Contact, as explained hereinbefore and, accordingly, no change occurs. The lirst impulse condition of the code combination is a negative impulse and relays 39 and' 41 are energized over the circuit from negative'battery-through armature 33, magnet 39 and relay 41 to ground'l Armature 49 is,"aocordingly, maintained in its energized position. Armature 42v is also maintained' in'. engagementv With its right hand or negative contact. The brush 66 is rotated at such a speed that, during the period While the brush 19 Wipes rover the segment 13, the brush 66 `Wipes o ver the first segment 62.' The rirst impulse of the code combination is, therefore, repeated over a circuit from negativevbattery at armature 4,2, over conductor 43, ring 44, brush 66, andthe lirst segment 62 to the first code selecting ima ;gi1et 63 to negative battery.

However, inasmuch as this circuit isk from negative battery to negative battery, it is not an energizing circuit and the lirst selecting magnet is not energized. This impulse con` stitutes a spacing impulse condition;

As the brush 19 Wipes over segment 14, a second spacing impulse condition is trans mitted in the manner described above, the brush 66 is at this time wiping over the second segment of the segmented ring 62, so that the second selecting magnet 63 remains deenergized. i y

' When the brush 19 engages the'. third segment 15, an impulse of `positive polarity from the positive busfis impressed over the above traced circuit through the Winding of sie` thel relay 37.. Armature 38 is thereupon thrown fromengagement with its left hand contact to its right hand contact.y In this case, the current in line 11 is again reversed f and relay 39 is, accordingly, momentarily deenergized. rlfhis, however, has noiefect on the magnet 48 at this time, since theibrush 46 is not in engagement with the stop segments 45, and accordingly, the circuit for; the 1,9. magnet 48 is still open atv this point.

Relay 41, however, responds to this marliing orpositive impulse and throws itsarmature 42from engagement with its right hand contact to engagementV with its left hand con- 15; tact. During this period, while the brush 19 is wiping overA the third segment 15, thebrush 66 is wiping over the third segment of ring 624. In this instance, current of positive polarity flows. over the conductor 43, over ring 44, brush 46, third segmenty 62, to thethird selector.. magnet 63 andv negative battery. The third selecting magnet is, accordingly, energized in accordance with the marking impulse condition.

Similarly, the fourth impulse condition is a marking impulse condition and operates the fourth selecting magnet accordingly.

During the time while the brush 19 was in engagement with the second segment 14 for 393 transmitting the second impulse condition,

as described in the above, brush 24 was in engagement with the second segment of ring 26. An energizing circuit was thereupon completed at the time from the positive busbar and the ifth contacter 31, through the winding of the relay 28, conductor 27, the second segment of ring 26, brushes 24and 23, ring 25, to ground. Relay 28 thereupon operated its armature 41 to engage its left hand or positive contact.

hen now the brush 19 engages the fifth segment 17, an energizing circuit is completed for the winding of relay 37 from positive battery over armature 41, winding of relay 33, segment 1'?, brushes 19 and 21, ring 22 and winding of relay 3'?, to ground.

Relay 3'? thereupon operates its armature 38 to its positive contact, just as in the case of the third and fourth impulse conditions.

'59 Relay 33 operates its armature to engage its left handV contact, which is, however, connected to negative polarity. In this manner,

the i'ive impulses of the code combinations are transmitted.

5,5.v 1t is assumed, as explained above, that the lrey 51 is still closed and stop magnet 53 is energized for the further transmission of other code combinations and, accordingly, brush arm 2O continues to rotate for another revolution over segment 18.

As stated hereinbefore, the motor at the receiving station is arranged to drive its associated brush slightly faster than the transmitting brushes are driven, so that brush 46 955 will have moved on to the stop segment an instant before brush arm 20 moves the brush 19 to segment 18. VVhennoW the brush 19 wipes over segment 18, current fromV the negative battery at armature 34A iows through the winding 37. l he armature of relay 37, being` at this time in engagement with its positive segment, in accordance with the fifth impulse condition, will be thrown to its opposite or negative segment and the magnet 39 is momentarily deenergized. explained in the above, magnet 48 is thereupon energized, releasing the brush 46 for another revolution and the above cycle of` operations are repeated,

lt will now be clear that the sixth impulse condition is invariably of a different polarity from the fifth impulse condition of the code condition. .lf the fifth code impulse condition such as to throw armature 41 of relay 28 to engage its negative contact for the transmission of a negative or spacing impulse condition, relay 33 is energized invariably to throw its armature 34 to the positive contact and vice versa. That means that between the fifth impulse and the start impulse condition, a reversal of current through the relay 37 takes place. ture 38 of relay 37 is, therefore, always thrown from Whichever contact it happens to be in engagement with, to its alternate Contact, momentarily deenergizing relay 39. rl`his momentary zero condition of the line 11 thus controls the starting of the distributor at the receiving station.

As it will now be further evident, a very simple and ingenious electrical circuit is provided for a start-stop telegraph system, employ-ing only sii: impulse conditions, and reducing the signalling time by one-seventh which is of considerable importance in high speed telegraphy.

Although we have disclosed our invention in connection with a specific adaptation thereof, it will be evident to those skilled in the art that it may be applied to other forms of signalling systems employing code combinations of impulse conditions where rotating members are to be maintained in synchronism.

What we claim is 1. In a printing telegraph transmitter; a rotary start-stop distributor; a sending contacter, for transmitting cone combinations of impulse conditions, electrically connected to said distributor; and electro-magnetic means connected to said contacter and controlledby the last impulse condition of each code combination for controlling the transmission ofi a start impulse condition.

I 2. In a printing telegraph transmitter; a rotary start-stop distributor; a sending contactor electrically connected to said distributor for transmitting code combinations of impulse conditions and means, including circuit connections from said contactor and cooper- The armaating with said distributor, for controlling the transmission of a synchronizing impulse 'condition to precede each code combination Y of impulse conditions.

3. ln a printing telegraph transmitter; a rotary start-stop distributor; a sending contactor cooperating therewith for transmitting code combinations of impulse conditions; and electro-magnetic means controlled in accordance Wi h the last impulse condition of each code combination and cooperating With said distributor for transmitting a start impulse condition preceding each code combination.

.4. ln a printing telegraph transmitter; a rotary start-stop distributor; a sending Contacter, certain contact-ors of which are connected to equivalent individual segmentsof said distributor; electro-magnetic means connected to one of said contactors of said contactor for controlling the transmission of one impulse condition for each code combination; and a second electro-magnetic means, controlled by said first electro-magnetic means,-

for controlling the transmission of a synchronizing impulse condition, in accordance Fil With the character of the impulse condition transmitted by said lirst electro-magnetic means. y

5. ln a printing telegraph transmitter; a rotary start-stop distributor; a sen der having confactors, certain of which are connected to the equivalent segmentsot said distributor; an electro-magnetic means connected to one of said contactcrs; means controlled by said electro-magnetic means for controlling the transmission ofthe last of each code combi-- nation vor impulse conditions; and second electro-magnetic means; controlled by said iirst electro-magnetic means; for controlling the transmission of a synchronizing impulse condition. x

6. ln a printing telegraph transmitter; a rotary start-stop distributor; a sender comprising a plurality of cont-actors, certain of which are connected to` segments of said distributor; and electro-magnetic means connected to a contacter of said sender for controlling the transmission et' an additional impulse condition for synchronizing, in accordance With the character of the last impulse f condition of each code combination.

ing distributor into operation.

Y tro-magnetic means for utilizing the inherent Zero moment of said signalling linev and electro-magnetic means at said receiving'station responsive to said momentary Zero period of said signalling line tor starting said receiv- 9. ln a printing telegraph system; a startstop transmitting distributor; a start-stop receiving distributor; a transmitter cooperating with said transmitting distributor;electro-magnetic means connected to said transmitter and :cooperating with said transmitting distributor for controllingy the transmission ot a start impulse condition preceding each code combination, Which is invariably different in character from the last impulse condition of each codeV combination; and an electro-magnet' at said receiving station `responsive to said synchronizing impulse conl0. ln a printing telegraph system; a' startstop transmitting distributor; a start-stop receiving distributor; a transmitter'cooperat-` ing Wit-h said transmitting distributor; electro-magnetic means connected Vto said transmitter and cooperating With said transmitting distributor vfor controlling the transmission of' a synchronizing impulse condition preceding each code combination, which is iiivariably different in character from the last impulse condition of each code combination; an electro-magnetic means at said receiving station responsive to said synchronizing impulse condition for controlling the starting of said receiving start-stop distributor; and mea-ns, including circuit connections, controlled by said last mentioned electro-magnetic means for controlling the starting of said receiving distributor.

ll. A system for telegraphy, comprising transmitting means operating at a uniform rate for transmitting code combinations of electrical selecting conditions, each preceded by a receiver start condition, diering in character from the last selecting condition entering into the preceding code combination g' a receiver stopped in operation at the end of each code combination; and electromagnetic means` responsive to the start condition preceding each code combination and including circuit connections for starting said receiver into operation.

i 12. ln a printing telegraph transmitter; a signalling line; a start-stop distributor; a sending contacter cooperating with saiddistributor for transmitting code combinations of impulse conditions over said line; and

.means controlled by said contacter for invariably introducing a momentary inherent Zero in said signalling line preceding tlie transmission of av Code combination of impulse conditions.

13. In a printing telegraph transmitter;

`a signalling line; a. start-stop distributor; a vsending contactor cooperating With said distributor for transmitting code combinations of impulse conditions over said lin-e; means controlled by said contactor for invariably introducing' a momentary inlierent Zero in said signallingiline preceding tlie transmission'of 'a code combination; av start-stop lreceiver at the receiving end ot' said line; and

.means responsive to the momentary zero of `the-line preceding eacli code combination for starting' .the receiver into operation.

14. In a printing telegraph transmitter; a signalling line; a start-stop distributor; a

sending' contacter cooperating with sait dis- -itiibutor ifor transmitting code combinations of impulse conditions over said line; means .controlled by saidcontactor vfor invariably .introducing a momentary inherent zero in said signalling line ,preceding tlie transmission of anode combination; a start-stop receiver at the receiving end of said line; and

-nieans responsive tothe momentary Zero of -tlie line only -ivlien it occurs preceding eacli codeicombination for starting'tlie receiver -into operation.

:Intestimon whereof ive affix our siOiiatures.

HERBERT ANGEL. 'JAMES W. lROBlNSON. 

